[VB.NET] ข้อมูลที่เก็บใน MySQL แสดงผลถาษาไทยเป็นภาษา "????????" แก้ยังไงดีครับ

Imports MySql.Data.MySqlClient


Public Class Form_coun

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Conn As MySqlConnection
        Conn = New MySqlConnection()
        Conn.ConnectionString = "Server=112.121.151.206;User Id=xxxxxxx; Password=xxxxxx; Database=ycklninh_counselor;"
        Try
            Conn.Open()
        Catch myerror As MySqlException
            MsgBox("ติดต่อฐานข้อมูลไม่ได้")
        End Try
        Dim myAdapter As New MySqlDataAdapter

        Dim sqlquery = "SELECT * FROM data WHERE code = '" + txtcode.Text + "' "
        Dim Mycommand As New MySqlCommand()
        Mycommand.Connection = Conn
        Mycommand.CommandText = sqlquery

        myAdapter.SelectCommand = Mycommand
        Dim mydata As MySqlDataReader
        mydata = Mycommand.ExecuteReader()
        If mydata.HasRows = 0 Then

            Conn.Close()
            Conn.Open()


            sqlquery = " INSERT INTO data (nickname, email, subj_head, sub_subj,code,type) VALUES ('" + txtnickname.Text + "','" + txtemail.Text + "','" + txtsubj_head.Text + "','" + txtsub_subj.Text + "','" + txtcode.Text + "','ยังไม่ได้แก้ไข')"
            Mycommand.Connection = Conn
            Mycommand.CommandText = sqlquery


            mydata = Mycommand.ExecuteReader()
            MsgBox("ส่งข้อมูลเก็บสู่ระบบเรียบร้อยแล้ว")
            Me.Hide()
        Else
            index.Show()


        End If

    End Sub
End Class